Fixes #4553: Smarty enhancements

docs/guide/tutorial-template-engines.md

@@ -106,9 +106,9 @@ Aliased class import:
 {{ use({'alias' => '/app/widgets/MyWidget'}) }}
 ```
 
-#### Referencing other views
+#### Referencing other templates
 
-There are two ways of referencing views in `include` and `extends` statements:
+There are two ways of referencing templates in `include` and `extends` statements:
 
 ```
 {% include "comment.twig" %}
@@ -118,8 +118,8 @@ There are two ways of referencing views in `include` and `extends` statements:
 {% extends "@app/views/layouts/2columns.twig" %}
 ```
 
-In the first case the view will be searched relatively to the path current view is in. For `comment.twig` and `post.twig`
-that means these will be searched in the same directory as the view that's rendered currently.
+In the first case the view will be searched relatively to the current template path. For `comment.twig` and `post.twig`
+that means these will be searched in the same directory as the currently rendered template.
 
 In the second case we're using path aliases. All the Yii aliases such as `@app` are available by default.
 
@@ -264,8 +264,9 @@ Then in the template you can apply filter using the following syntax:
 Smarty
 ------
 
-To use Smarty, you need to create templates in files that have the `.tpl` extension (or use another file extension but configure the component accordingly). Unlike standard view files, when using Smarty you must include the extension in your `$this->render()`
-or `$this->renderPartial()` controller calls:
+To use Smarty, you need to create templates in files that have the `.tpl` extension (or use another file extension but
+configure the component accordingly). Unlike standard view files, when using Smarty you must include the extension in
+your `$this->render()` or `$this->renderPartial()` controller calls:
 
 ```php
 return $this->render('renderer.tpl', ['username' => 'Alex']);
@@ -277,20 +278,173 @@ The best resource to learn Smarty template syntax is its official documentation
 [www.smarty.net](http://www.smarty.net/docs/en/). Additionally there are Yii-specific syntax extensions
 described below.
 
-#### Additional functions
+#### Setting object properties
+
+There's a special function called `set` that allows you to set common properties of the view and controller. Currently
+available properties are `title`, `theme` and `layout`:
+
+```
+{set title="My Page"}
+{set theme="frontend"}
+{set layout="main.tpl"}
+```
+
+For title there's dedicated block as well:
+
+```
+{title}My Page{/title}
+```
+
+#### Setting meta tags
+
+Meta tags could be set like to following:
+
+```
+{meta keywords="Yii,PHP,Smarty,framework"}
+```
+
+There's also dedicated block for description:
+
+```
+{description}This is my page about Smarty extension{/description}
+```
+
+#### Calling object methods
+
+Sometimes you need calling
+
+#### Importing static classes, using widgets as functions and blocks
+
+You can import additional static classes right in the template:
+
+```
+{use class="yii\helpers\Html"}
+{Html::mailto('eugenia@example.com')}
+```
+
+If you want you can set custom alias:
+
+```
+{use class="yii\helpers\Html" as="Markup"}
+{Markup::mailto('eugenia@example.com')}
+```
+
+Extension helps using widgets in convenient way converting their syntax to function calls or blocks. For regular widgets
+function could be used like the following:
+
+```
+{use class='@yii\grid\GridView' type='function'}
+{GridView dataProvider=$provider}
+```
+
+For widgets with `begin` and `end` methods such as ActiveForm it's better to use block:
+
+```
+{use class='yii\widgets\ActiveForm' type='block'}
+{ActiveForm assign='form' id='login-form' action='/form-handler' options=['class' => 'form-horizontal']}
+    {$form->field($model, 'firstName')}
+    <div class="form-group">
+        <div class="col-lg-offset-1 col-lg-11">
+            <input type="submit" value="Login" class="btn btn-primary" />
+        </div>
+    </div>
+{/ActiveForm}
+```
+
+If you're using particular widget a lot, it is a good idea to declare it in application config and remove `{use class`
+call from templates:
+
+```php
+'components' => [
+    'view' => [
+        // ...
+        'renderers' => [
+            'tpl' => [
+                'class' => 'yii\smarty\ViewRenderer',
+                'widgets' => [
+                    'blocks' => [
+                        'ActiveForm' => '\yii\widgets\ActiveForm',
+                    ],
+                ],
+            ],
+        ],
+    ],
+],
+```
+
+#### Referencing other templates
+
+There are two main ways of referencing templates in `include` and `extends` statements:
+
+```
+{include 'comment.tpl'}
+{extends 'post.tpl'}
+
+{include '@app/views/snippets/avatar.tpl'}
+{extends '@app/views/layouts/2columns.tpl'}
+```
+
+In the first case the view will be searched relatively to the current template path. For `comment.tpl` and `post.tpl`
+that means these will be searched in the same directory as the currently rendered template.
+
+In the second case we're using path aliases. All the Yii aliases such as `@app` are available by default.
+
+#### CSS, JavaScript and asset bundles
 
-Yii adds the following construct to the standard Smarty syntax:
+In order to register JavaScript and CSS files the following syntax could be used:
+
+```
+{registerJsFile url='http://maps.google.com/maps/api/js?sensor=false' position='POS_END'}
+{registerCssFile url='@assets/css/normalizer.css'}
+```
+
+If you need JavaScript and CSS directly in the template there are convenient blocks:
+
+```
+{registerJs key='show' position='POS_LOAD'}
+    $("span.show").replaceWith('<div class="show">');
+{/registerJs}
+
+{registerCss}
+div.header {
+    background-color: #3366bd;
+    color: white;
+}
+{/registerCss}
+```
+
+Asset bundles could be registered the following way:
+
+```
+{use class="yii\web\JqueryAsset"}
+{JqueryAsset::register($this)|void}
+```
+
+Here we're using `void` modifier because we don't need method call result.
+
+#### URLs
+
+There are two functions you can use for building URLs:
 
 ```php
 <a href="{path route='blog/view' alias=$post.alias}">{$post.title}</a>
+<a href="{url route='blog/view' alias=$post.alias}">{$post.title}</a>
 ```
 
-Internally, the `path()` function calls Yii's `Url::to()` method.
+`path` generates relative URL while `url` generates absolute one. Internally both are using [[\yii\helpers\Url]].
 
 #### Additional variables
 
-Within Smarty templates, you can also make use of these variables:
+Within Smarty templates the following variables are always defined:
 
 - `$app`, which equates to `\Yii::$app`
 - `$this`, which equates to the current `View` object
 
+#### Accessing config params
+
+Yii parameters that are available in your application through `Yii::$app->params->something` could be used the following
+way:
+
+```
+`{#something#}`
+```

extensions/smarty/CHANGELOG.md

@@ -4,8 +4,26 @@ Yii Framework 2 smarty extension Change Log
 2.0.0-rc under development
 --------------------------
 
-- no changes in this release.
-
+- Enh #4619 (samdark, hwmaier)
+    - New functions:
+        - `url` generates absolute URL.
+        - `set` allows setting commonly used view paramters: `title`, `theme` and `layout`.
+        - `meta` registers meta tag.
+        - `registerJsFile` registers JavaScript file.
+        - `registerCssFile` registers CSS file.
+        - `use` allows importing classes to the template and optionally provides these as functions and blocks.
+    - New blocks:
+        - `title`.
+        - `description`.
+        - `registerJs`.
+        - `registerCss`.
+    - New modifier `void` that allows calling functions and ignoring result.
+    - Moved most of Yii custom syntax into `\yii\smarty\Extension` class that could be extended via `extensionClass` property.
+    - Added ability to set Smarty options via config using `options`.
+    - Added `imports` property that accepts an array of classes imported into template namespace.
+    - Added `widgets` property that can be used to import widgets as Smarty tags.
+    - `Yii::$app->params['paramKey']` values are now accessible as Smarty config variables `{#paramKey#}`.
+    - Added ability to use Yii aliases in `extends` and `require`.
 
 2.0.0-beta April 13, 2014
 -------------------------

extensions/smarty/Extension.php

+<?php
+/**
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright (c) 2008 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+namespace yii\smarty;
+
+use Smarty;
+use Yii;
+use yii\helpers\ArrayHelper;
+use yii\helpers\Url;
+use yii\web\View;
+
+/**
+ * Extension provides Yii-specific syntax for Smarty templates.
+ *
+ * @author Alexander Makarov <sam@rmcreative.ru>
+ * @author Henrik Maier <hwmaier@gmail.com>
+ */
+class Extension
+{
+    /**
+     * @var ViewRenderer
+     */
+    protected $viewRenderer;
+
+    /**
+     * @var Smarty
+     */
+    protected $smarty;
+
+    /**
+     * @param ViewRenderer $viewRenderer
+     * @param Smarty $smarty
+     */
+    public function __construct($viewRenderer, $smarty)
+    {
+        $this->viewRenderer = $viewRenderer;
+        $smarty = $this->smarty = $smarty;
+
+        $smarty->registerPlugin('function', 'path', [$this, 'functionPath']);
+        $smarty->registerPlugin('function', 'url', [$this, 'functionUrl']);
+        $smarty->registerPlugin('function', 'set', [$this, 'functionSet']);
+        $smarty->registerPlugin('function', 'meta', [$this, 'functionMeta']);
+        $smarty->registerPlugin('function', 'registerJsFile', [$this, 'functionRegisterJsFile']);
+        $smarty->registerPlugin('function', 'registerCssFile', [$this, 'functionRegisterCssFile']);
+        $smarty->registerPlugin('block', 'title', [$this, 'blockTitle']);
+        $smarty->registerPlugin('block', 'description', [$this, 'blockDescription']);
+        $smarty->registerPlugin('block', 'registerJs', [$this, 'blockJavaScript']);
+        $smarty->registerPlugin('block', 'registerCss', [$this, 'blockCss']);
+        $smarty->registerPlugin('compiler', 'use', [$this, 'compilerUse']);
+        $smarty->registerPlugin('modifier', 'void', [$this, 'modifierVoid']);
+    }
+
+    /**
+     * Smarty template function to get relative URL for using in links
+     *
+     * Usage is the following:
+     *
+     * {path route='blog/view' alias=$post.alias user=$user.id}
+     *
+     * where route is Yii route and the rest of parameters are passed as is.
+     *
+     * @param array $params
+     * @param \Smarty_Internal_Template $template
+     *
+     * @return string
+     */
+    public function functionPath($params, \Smarty_Internal_Template $template)
+    {
+        if (!isset($params['route'])) {
+            trigger_error("path: missing 'route' parameter");
+        }
+
+        array_unshift($params, $params['route']) ;
+        unset($params['route']);
+
+        return Url::to($params, true);
+    }
+
+    /**
+     * Smarty template function to get absolute URL for using in links
+     *
+     * Usage is the following:
+     *
+     * {path route='blog/view' alias=$post.alias user=$user.id}
+     *
+     * where route is Yii route and the rest of parameters are passed as is.
+     *
+     * @param array $params
+     * @param \Smarty_Internal_Template $template
+     *
+     * @return string
+     */
+    public function functionUrl($params, \Smarty_Internal_Template $template)
+    {
+        if (!isset($params['route'])) {
+            trigger_error("path: missing 'route' parameter");
+        }
+
+        array_unshift($params, $params['route']) ;
+        unset($params['route']);
+
+        return Url::to($params, true);
+    }
+
+    /**
+     * Smarty compiler function plugin
+     * Usage is the following:
+     *
+     * {use class="app\assets\AppAsset"}
+     * {use class="yii\helpers\Html"}
+     * {use class='yii\widgets\ActiveForm' type='block'}
+     * {use class='@app\widgets\MyWidget' as='my_widget' type='function'}
+     *
+     * Supported attributes: class, as, type. Type defaults to 'static'.
+     *
+     * @param $params
+     * @param \Smarty_Internal_Template $template
+     * @return string
+     * @note Even though this method is public it should not be called directly.
+     */
+    public function compilerUse($params, $template)
+    {
+        if (!isset($params['class'])) {
+            trigger_error("use: missing 'class' parameter");
+        }
+        // Compiler plugin parameters may include quotes, so remove them
+        foreach ($params as $key => $value) {
+            $params[$key] = trim($value, '\'""');
+        }
+
+        $class = $params['class'];
+        $alias = ArrayHelper::getValue($params, 'as', basename($params['class']));
+        $type = ArrayHelper::getValue($params, 'type', 'static');
+
+        // Register the class during compile time
+        $this->smarty->registerClass($alias, $class);
+
+        if ($type === 'block') {
+            // Register widget tag during compile time
+            $this->viewRenderer->widgets['blocks'][$alias] = $class;
+            $this->smarty->registerPlugin('block', $alias, [$this->viewRenderer, '_widget_block__' . $alias]);
+
+            // Inject code to re-register widget tag during run-time
+            return <<<PHP
+<?php
+    \$_smarty_tpl->getGlobal('_viewRenderer')->widgets['blocks']['$alias'] = '$class';
+    try {
+        \$_smarty_tpl->registerPlugin('block', '$alias', [\$_smarty_tpl->getGlobal('_viewRenderer'), '_widget_block__$alias']);
+    }
+    catch (SmartyException \$e) {
+        /* Ignore already registered exception during first execution after compilation */
+    }
+?>
+PHP;
+        } elseif ($type === 'function') {
+            // Register widget tag during compile time
+            $this->viewRenderer->widgets['functions'][$alias] = $class;
+            $this->smarty->registerPlugin('function', $alias, [$this->viewRenderer, '_widget_function__' . $alias]);
+
+            // Inject code to re-register widget tag during run-time
+            return <<<PHP
+<?php
+    \$_smarty_tpl->getGlobal('_viewRenderer')->widgets['functions']['$alias'] = '$class';
+    try {
+        \$_smarty_tpl->registerPlugin('function', '$alias', [\$_smarty_tpl->getGlobal('_viewRenderer'), '_widget_function__$alias']);
+    }
+    catch (SmartyException \$e) {
+        /* Ignore already registered exception during first execution after compilation */
+    }
+?>
+PHP;
+        }
+    }
+
+    /**
+     * Smarty modifier plugin
+     * Converts any output to void
+     * @param mixed $arg
+     * @return string
+     * @note Even though this method is public it should not be called directly.
+     */
+    public function modifierVoid($arg)
+    {
+        return;
+    }
+
+    /**
+     * Smarty function plugin
+     * Usage is the following:
+     *
+     * {set title="My Page"}
+     * {set theme="frontend"}
+     * {set layout="main.tpl"}
+     *
+     * Supported attributes: title, theme, layout
+     *
+     * @param $params
+     * @param \Smarty_Internal_Template $template
+     * @return string
+     * @note Even though this method is public it should not be called directly.
+     */
+    public function functionSet($params, $template)
+    {
+        if (isset($params['title'])) {
+            $template->tpl_vars['this']->value->title = Yii::$app->getView()->title = ArrayHelper::remove($params, 'title');
+        }
+        if (isset($params['theme'])) {
+            $template->tpl_vars['this']->value->theme = Yii::$app->getView()->theme = ArrayHelper::remove($params, 'theme');
+        }
+        if (isset($params['layout'])) {
+            Yii::$app->controller->layout = ArrayHelper::remove($params, 'layout');
+        }
+
+        // We must have consumed all allowed parameters now, otherwise raise error
+        if (!empty($params)) {
+            trigger_error('set: Unsupported parameter attribute');
+        }
+    }
+
+    /**
+     * Smarty function plugin
+     * Usage is the following:
+     *
+     * {meta keywords="Yii,PHP,Smarty,framework"}
+     *
+     * Supported attributes: any; all attributes are passed as
+     * parameter array to Yii's registerMetaTag function.
+     *
+     * @param $params
+     * @param \Smarty_Internal_Template $template
+     * @return string
+     * @note Even though this method is public it should not be called directly.
+     */
+    public function functionMeta($params, $template)
+    {
+        $key = isset($params['name']) ? $params['name'] : null;
+
+        Yii::$app->getView()->registerMetaTag($params, $key);
+    }
+
+    /**
+     * Smarty block function plugin
+     * Usage is the following:
+     *
+     * {title} Web Site Login {/title}
+     *
+     * Supported attributes: none.
+     *
+     * @param $params
+     * @param $content
+     * @param \Smarty_Internal_Template $template
+     * @param $repeat
+     * @return string
+     * @note Even though this method is public it should not be called directly.
+     */
+    public function blockTitle($params, $content, $template, &$repeat)
+    {
+        if ($content !== null) {
+            Yii::$app->getView()->title = $content;
+        }
+    }
+
+    /**
+     * Smarty block function plugin
+     * Usage is the following:
+     *
+     * {description}
+     *     The text between the opening and closing tags is added as
+     *     meta description tag to the page output.
+     * {/description}
+     *
+     * Supported attributes: none.
+     *
+     * @param $params
+     * @param $content
+     * @param \Smarty_Internal_Template $template
+     * @param $repeat
+     * @return string
+     * @note Even though this method is public it should not be called directly.
+     */
+    public function blockDescription($params, $content, $template, &$repeat)
+    {
+        if ($content !== null) {
+            // Clean-up whitespace and newlines
+            $content = preg_replace('/\s+/', ' ', trim($content));
+
+            Yii::$app->getView()->registerMetaTag(['name' => 'description',
+                                                   'content' => $content],
+                                                   'description');
+        }
+    }
+
+    /**
+     * Smarty function plugin
+     * Usage is the following:
+     *
+     * {registerJsFile url='http://maps.google.com/maps/api/js?sensor=false' position='POS_END'}
+     *
+     * Supported attributes: url, key, depends, position and valid HTML attributes for the script tag.
+     * Refer to Yii documentation for details.
+     * The position attribute is passed as text without the class prefix.
+     * Default is 'POS_END'.
+     *
+     * @param $params
+     * @param \Smarty_Internal_Template $template
+     * @return string
+     * @note Even though this method is public it should not be called directly.
+     */
+    public function functionRegisterJsFile($params, $template)
+    {
+        if (!isset($params['url'])) {
+            trigger_error("registerJsFile: missing 'url' parameter");
+        }
+
+        $url = ArrayHelper::remove($params, 'url');
+        $key = ArrayHelper::remove($params, 'key', null);
+        $depends = ArrayHelper::remove($params, 'depends', null);
+        if (isset($params['position']))
+            $params['position'] = $this->getViewConstVal($params['position'], View::POS_END);
+
+        Yii::$app->getView()->registerJsFile($url, $depends, $params, $key);
+    }
+
+    /**
+     * Smarty block function plugin
+     * Usage is the following:
+     *
+     * {registerJs key='show' position='POS_LOAD'}
+     *     $("span.show").replaceWith('<div class="show">');
+     * {/registerJs}
+     *
+     * Supported attributes: key, position. Refer to Yii documentation for details.
+     * The position attribute is passed as text without the class prefix.
+     * Default is 'POS_READY'.
+     *
+     * @param $params
+     * @param $content
+     * @param \Smarty_Internal_Template $template
+     * @param $repeat
+     * @return string
+     * @note Even though this method is public it should not be called directly.
+     */
+    public function blockJavaScript($params, $content, $template, &$repeat)
+    {
+        if ($content !== null) {
+            $key = isset($params['key']) ? $params['key'] : null;
+            $position = isset($params['position']) ? $params['position'] : null;
+
+            Yii::$app->getView()->registerJs($content,
+                                             $this->getViewConstVal($position, View::POS_READY),
+                                             $key);
+        }
+    }
+
+    /**
+     * Smarty function plugin
+     * Usage is the following:
+     *
+     * {registerCssFile url='@assets/css/normalizer.css'}
+     *
+     * Supported attributes: url, key, depends and valid HTML attributes for the link tag.
+     * Refer to Yii documentation for details.
+     *
+     * @param $params
+     * @param \Smarty_Internal_Template $template
+     * @return string
+     * @note Even though this method is public it should not be called directly.
+     */
+    public function functionRegisterCssFile($params, $template)
+    {
+        if (!isset($params['url'])) {
+            trigger_error("registerCssFile: missing 'url' parameter");
+        }
+
+        $url = ArrayHelper::remove($params, 'url');
+        $key = ArrayHelper::remove($params, 'key', null);
+        $depends = ArrayHelper::remove($params, 'depends', null);
+
+        Yii::$app->getView()->registerCssFile($url, $depends, $params, $key);
+    }
+
+    /**
+     * Smarty block function plugin
+     * Usage is the following:
+     *
+     * {registerCss}
+     * div.header {
+     *     background-color: #3366bd;
+     *     color: white;
+     * }
+     * {/registerCss}
+     *
+     * Supported attributes: key and valid HTML attributes for the style tag.
+     * Refer to Yii documentation for details.
+     *
+     * @param $params
+     * @param $content
+     * @param \Smarty_Internal_Template $template
+     * @param $repeat
+     * @return string
+     * @note Even though this method is public it should not be called directly.
+     */
+    public function blockCss($params, $content, $template, &$repeat)
+    {
+        if ($content !== null) {
+            $key = isset($params['key']) ? $params['key'] : null;
+
+            Yii::$app->getView()->registerCss($content, $params, $key);
+        }
+    }
+
+    /**
+    * Helper function to convert a textual constant identifier to a View class
+    * integer constant value.
+    *
+    * @param string $string Constant identifier name
+    * @param integer $default Default value
+    * @return mixed
+    */
+   protected function getViewConstVal($string, $default)
+   {
+      $val = @constant('yii\web\View::' . $string);
+      return isset($val) ? $val : $default;
+   }
+} 
\ No newline at end of file

extensions/smarty/ViewRenderer.php

@@ -9,14 +9,17 @@ namespace yii\smarty;
 
 use Yii;
 use Smarty;
-use yii\base\View;
+use yii\web\View;
+use yii\base\Widget;
 use yii\base\ViewRenderer as BaseViewRenderer;
-use yii\helpers\Url;
+use yii\base\InvalidConfigException;
+use yii\helpers\ArrayHelper;
 
 /**
  * SmartyViewRenderer allows you to use Smarty templates in views.
  *
  * @author Alexander Makarov <sam@rmcreative.ru>
+ * @author Henrik Maier <hwmaier@gmail.com>
  * @since 2.0
  */
 class ViewRenderer extends BaseViewRenderer
@@ -29,45 +32,202 @@ class ViewRenderer extends BaseViewRenderer
      * @var string the directory or path alias pointing to where Smarty compiled templates will be stored.
      */
     public $compilePath = '@runtime/Smarty/compile';
+
+    /**
+     * @var array Add additional directories to Smarty's search path for plugins.
+     */
+    public $pluginDirs = [];
+    /**
+     * @var array Class imports similar to the use tag
+     */
+    public $imports = [];
     /**
-     * @var Smarty
+     * @var array Widget declarations
      */
-    public $smarty;
+    public $widgets = ['functions' => [], 'blocks' => []];
+    /**
+     * @var Smarty The Smarty object used for rendering
+     */
+    protected $smarty;
 
+    /**
+     * @var array additional Smarty options
+     * @see http://www.smarty.net/docs/en/api.variables.tpl
+     */
+    public $options = [];
 
+    /**
+     * @var string extension class name
+     */
+    public $extensionClass = '\yii\smarty\Extension';
+
+
+    /**
+     * Instantiates and configures the Smarty object.
+     */
     public function init()
     {
         $this->smarty = new Smarty();
         $this->smarty->setCompileDir(Yii::getAlias($this->compilePath));
         $this->smarty->setCacheDir(Yii::getAlias($this->cachePath));
 
-        $this->smarty->registerPlugin('function', 'path', [$this, 'smarty_function_path']);
+        foreach ($this->options as $key => $value) {
+            $this->smarty->$key = $value;
+        }
+
+        $this->smarty->setTemplateDir([
+            dirname(Yii::$app->getView()->getViewFile()),
+            Yii::$app->getViewPath(),
+        ]);
+
+        // Add additional plugin dirs from configuration array, apply Yii's dir convention
+        foreach ($this->pluginDirs as &$dir) {
+            $dir = $this->resolveTemplateDir($dir);
+        }
+        $this->smarty->addPluginsDir($this->pluginDirs);
+
+        if (isset($this->imports)) {
+            foreach(($this->imports) as $tag => $class) {
+                $this->smarty->registerClass($tag, $class);
+            }
+        }
+        // Register block widgets specified in configuration array
+        if (isset($this->widgets['blocks'])) {
+            foreach(($this->widgets['blocks']) as $tag => $class) {
+                $this->smarty->registerPlugin('block', $tag, [$this, '_widget_block__' . $tag]);
+                $this->smarty->registerClass($tag, $class);
+            }
+        }
+        // Register function widgets specified in configuration array
+        if (isset($this->widgets['functions'])) {
+            foreach(($this->widgets['functions']) as $tag => $class) {
+                $this->smarty->registerPlugin('function', $tag, [$this, '_widget_func__' . $tag]);
+                $this->smarty->registerClass($tag, $class);
+            }
+        }
+
+        new $this->extensionClass($this, $this->smarty);
+
+        $this->smarty->default_template_handler_func = [$this, 'aliasHandler'];
     }
 
     /**
-     * Smarty template function to get a path for using in links
-     *
-     * Usage is the following:
+     * The directory can be specified in Yii's standard convention
+     * using @, // and / prefixes or no prefix for view relative directories.
      *
-     * {path route='blog/view' alias=$post.alias user=$user.id}
-     *
-     * where route is Yii route and the rest of parameters are passed as is.
+     * @param string $dir directory name to be resolved
+     * @return string the resolved directory name
+     */
+    protected function resolveTemplateDir($dir)
+    {
+        if (strncmp($dir, '@', 1) === 0) {
+            // e.g. "@app/views/dir"
+            $dir = Yii::getAlias($dir);
+        } elseif (strncmp($dir, '//', 2) === 0) {
+            // e.g. "//layouts/dir"
+            $dir = Yii::$app->getViewPath() . DIRECTORY_SEPARATOR . ltrim($dir, '/');
+        } elseif (strncmp($dir, '/', 1) === 0) {
+            // e.g. "/site/dir"
+            if (Yii::$app->controller !== null) {
+                $dir = Yii::$app->controller->module->getViewPath() . DIRECTORY_SEPARATOR . ltrim($dir, '/');
+            } else {
+                // No controller, what to do?
+            }
+        } else {
+            // relative to view file
+            $dir = dirname(Yii::$app->getView()->getViewFile()) . DIRECTORY_SEPARATOR . $dir;
+        }
+
+        return $dir;
+    }
+
+    /**
+     * Mechanism to pass a widget's tag name to the callback function.
      *
-     * @param $params
-     * @param \Smarty_Internal_Template $template
+     * Using a magic function call would not be necessary if Smarty would
+     * support closures. Smarty closure support is announced for 3.2,
+     * until its release magic function calls are used to pass the
+     * tag name to the callback.
      *
+     * @param string $method
+     * @param array $args
+     * @throws InvalidConfigException
+     * @throws \BadMethodCallException
      * @return string
      */
-    public function smarty_function_path($params, \Smarty_Internal_Template $template)
+    public function __call($method, $args)
     {
-        if (!isset($params['route'])) {
-            trigger_error("path: missing 'route' parameter");
+        $methodInfo = explode('__', $method);
+        if (count($methodInfo) === 2) {
+            $alias = $methodInfo[1];
+            if (isset($this->widgets['functions'][$alias])) {
+                if (($methodInfo[0] === '_widget_func') && (count($args) === 2)) {
+                    return $this->widgetFunction($this->widgets['functions'][$alias], $args[0], $args[1]);
+                }
+            } elseif (isset($this->widgets['blocks'][$alias])) {
+                if (($methodInfo[0] === '_widget_block') && (count($args) === 4)) {
+                    return $this->widgetBlock($this->widgets['blocks'][$alias], $args[0], $args[1], $args[2], $args[3]);
+                }
+            } else {
+                throw new InvalidConfigException('Widget "' . $alias . '" not declared.');
+            }
         }
 
-        array_unshift($params, $params['route']) ;
-        unset($params['route']);
+        throw new \BadMethodCallException('Method does not exist: ' . $method);
+    }
+
+    /**
+     * Smarty plugin callback function to support widget as Smarty blocks.
+     * This function is not called directly by Smarty but through a
+     * magic __call wrapper.
+     *
+     * Example usage is the following:
+     *
+     *    {ActiveForm assign='form' id='login-form'}
+     *        {$form->field($model, 'username')}
+     *        {$form->field($model, 'password')->passwordInput()}
+     *        <div class="form-group">
+     *            <input type="submit" value="Login" class="btn btn-primary" />
+     *        </div>
+     *    {/ActiveForm}
+     */
+    private function widgetBlock($class, $params, $content, \Smarty_Internal_Template $template, &$repeat)
+    {
+        // Check if this is the opening ($content is null) or closing tag.
+        if ($content === null) {
+            $params['class'] = $class;
+            // Figure out where to put the result of the widget call, if any
+            $assign = ArrayHelper::remove($params, 'assign', false);
+            ob_start();
+            ob_implicit_flush(false);
+            $widget = Yii::createObject($params);
+            Widget::$stack[] = $widget;
+            if ($assign) {
+                $template->assign($assign, $widget);
+            }
+        } else {
+            $widget = array_pop(Widget::$stack);
+            echo $content;
+            $out = $widget->run();
+            return ob_get_clean() . $out;
+        }
+    }
 
-        return Url::to($params);
+    /**
+     * Smarty plugin callback function to support widgets as Smarty functions.
+     * This function is not called directly by Smarty but through a
+     * magic __call wrapper.
+     *
+     * Example usage is the following:
+     *
+     * {GridView dataProvider=$provider}
+     *
+     */
+    private function widgetFunction($class, $params, \Smarty_Internal_Template $template)
+    {
+        $repeat = false;
+        $this->widgetBlock($class, $params, null, $template, $repeat); // $widget->init(...)
+        return $this->widgetBlock($class, $params, '', $template, $repeat); // $widget->run()
     }
 
     /**
@@ -79,17 +239,35 @@ class ViewRenderer extends BaseViewRenderer
      * @param View $view the view object used for rendering the file.
      * @param string $file the view file.
      * @param array $params the parameters to be passed to the view file.
-     *
      * @return string the rendering result
      */
     public function render($view, $file, $params)
     {
         /* @var $template \Smarty_Internal_Template */
-        $template = $this->smarty->createTemplate($file, null, null, empty($params) ? null : $params, true);
+        $template = $this->smarty->createTemplate($file, null, null, empty($params) ? null : $params, false);
+
+        // Make Yii params available as smarty config variables
+        $template->config_vars = Yii::$app->params;
 
         $template->assign('app', \Yii::$app);
         $template->assign('this', $view);
 
         return $template->fetch();
     }
+
+    /**
+     * Resolves Yii alias into file path
+     *
+     * @param string $type
+     * @param string $name
+     * @param string $content
+     * @param string $modified
+     * @param Smarty $smarty
+     * @return bool|string path to file or false if it's not found
+     */
+    public function aliasHandler($type, $name, &$content, &$modified, Smarty $smarty)
+    {
+        $file = Yii::getAlias($name);
+        return is_file($file) ? $file : false;
+    }
 }

tests/unit/extensions/smarty/ViewRendererTest.php

@@ -10,6 +10,7 @@ namespace yiiunit\extensions\smarty;
 use yii\web\AssetManager;
 use yii\web\View;
 use Yii;
+use yiiunit\data\base\Singer;
 use yiiunit\TestCase;
 
 /**
@@ -41,6 +42,47 @@ class ViewRendererTest extends TestCase
         $this->assertEquals('test view Hello World!.', $content);
     }
 
+    public function testLayoutAssets()
+    {
+        $view = $this->mockView();
+        $content = $view->renderFile('@yiiunit/extensions/smarty/views/layout.tpl');
+
+        $this->assertEquals(1, preg_match('#<script src="/assets/[0-9a-z]+/jquery\\.js"></script>\s*</body>#', $content), 'Content does not contain the jquery js:' . $content);
+    }
+
+
+    public function testChangeTitle()
+    {
+        $view = $this->mockView();
+        $view->title = 'Original title';
+
+        $content = $view->renderFile('@yiiunit/extensions/smarty/views/changeTitle.tpl');
+        $this->assertTrue(strpos($content, 'New title') !== false, 'New title should be there:' . $content);
+        $this->assertFalse(strpos($content, 'Original title') !== false, 'Original title should not be there:' . $content);
+    }
+
+    public function testForm()
+    {
+        $view = $this->mockView();
+        $model = new Singer();
+        $content = $view->renderFile('@yiiunit/extensions/smarty/views/form.tpl', ['model' => $model]);
+        $this->assertEquals(1, preg_match('#<form id="login-form" class="form-horizontal" action="/form-handler" method="post">.*?</form>#s', $content), 'Content does not contain form:' . $content);
+    }
+
+    public function testInheritance()
+    {
+        $view = $this->mockView();
+        $content = $view->renderFile('@yiiunit/extensions/smarty/views/extends2.tpl');
+        $this->assertTrue(strpos($content, 'Hello, I\'m inheritance test!') !== false, 'Hello, I\'m inheritance test! should be there:' . $content);
+        $this->assertTrue(strpos($content, 'extends2 block') !== false, 'extends2 block should be there:' . $content);
+        $this->assertFalse(strpos($content, 'extends1 block') !== false, 'extends1 block should not be there:' . $content);
+
+        $content = $view->renderFile('@yiiunit/extensions/smarty/views/extends3.tpl');
+        $this->assertTrue(strpos($content, 'Hello, I\'m inheritance test!') !== false, 'Hello, I\'m inheritance test! should be there:' . $content);
+        $this->assertTrue(strpos($content, 'extends3 block') !== false, 'extends3 block should be there:' . $content);
+        $this->assertFalse(strpos($content, 'extends1 block') !== false, 'extends1 block should not be there:' . $content);
+    }
+
     /**
      * @return View
      */
@@ -50,6 +92,9 @@ class ViewRendererTest extends TestCase
             'renderers' => [
                 'tpl' => [
                     'class' => 'yii\smarty\ViewRenderer',
+                    'options' => [
+                        'force_compile' => true, // always recompile templates, don't do it in production
+                    ],
                 ],
             ],
             'assetManager' => $this->mockAssetManager(),

tests/unit/extensions/smarty/views/changeTitle.tpl

+{set title='New title'}
+
+<title>{$this->title}</title>
\ No newline at end of file

tests/unit/extensions/smarty/views/extends1.tpl

+Hello, I'm inheritance test!
+
+{block name=test}
+extends1 block
+{/block}
\ No newline at end of file

tests/unit/extensions/smarty/views/extends2.tpl

+{extends file="@yiiunit/extensions/smarty/views/extends1.tpl"}
+
+{block name=test}
+extends2 block
+{/block}
\ No newline at end of file

tests/unit/extensions/smarty/views/extends3.tpl

+{extends file="@yiiunit/extensions/smarty/views/extends1.tpl"}
+
+{block name=test}
+extends3 block
+{/block}
\ No newline at end of file

tests/unit/extensions/smarty/views/form.tpl

+{use class='yii\widgets\ActiveForm' type='block'}
+{ActiveForm assign='form' id='login-form' action='/form-handler' options=['class' => 'form-horizontal']}
+    {$form->field($model, 'firstName')}
+    <div class="form-group">
+        <div class="col-lg-offset-1 col-lg-11">
+            <input type="submit" value="Login" class="btn btn-primary" />
+        </div>
+    </div>
+{/ActiveForm}
\ No newline at end of file

tests/unit/extensions/smarty/views/layout.tpl

+{use class="yii\web\JqueryAsset"}
+{JqueryAsset::register($this)|void}
+{$this->beginPage()}
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="{$app->charset}"/>
+    <title>{$this->title|escape}</title>
+    {$this->head()}
+</head>
+<body>
+{$this->beginBody()}
+    body
+{$this->endBody()}
+</body>
+{$this->endPage()}
\ No newline at end of file